Tractor



FIG. 1 is an enlarged front view of the tractor showing our new design;

FIG. 2 is an enlarged rear view thereof;

FIG. 3 is a reduced left side view thereof;

FIG. 4 is a reduced right side view thereof;

FIG. 5 is a reduced top plan view thereof;

FIG. 6 is a reduced front perspective view thereof;

FIG. 7 is a reduced rear perspective view thereof;

FIG. 8 is an enlarged right side view of a portion of the tractor; and,

FIG. 9 is an enlarged front perspective view of a portion of the tractor. 

The ornamental design for a tractor, as shown and described. 